Chemistry · Oct / Nov 2021 · Paper 42 · Question 2
0620
As printed in the paper
The question as text
Acids are important laboratory chemicals.
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Show the answer and mark scheme
2(a)(i)[1]
strong
2(a)(ii)[2]
2H+ + SO42–
H+ (1) correct equation (1)
2(a)(iii)[1]
pink / red
2(b)(i)[2]
ZnCO3(s) + 2HNO3(aq) →
Zn(NO3)2(aq) + H2O(l) + CO2(g)
reactant states (1) product states (1)
2(b)(ii)[4]
M1 125
M2 2.5 / 125 = 0.02(00)
M3 0.02(00) × 2 = 0.04(00)
M4 0.04(00) × 1000 / 20 = 2(.00)
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